function b(){
    alert("b不不不");
}
function c(){
    alert("c");
}
b();

$(function(){
    var data={
        name:"index"
    };
    const foo = ()=>{
        data = Object.assign(data,{
            age:'18'
        });
    };
    foo();
    let keys = Object.keys(data);
    console.log(keys);
});